Question about Cars & Trucks
Air only comes out of defrost vent and not out of dash.
See the diagrams attached. God bless you
Posted on Jul 27, 2013
Is the engine all the way on? And do you have it to where it's set to only come out of the defrost vent?
Posted on Jul 27, 2013
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Posted on Jan 02, 2017
SOURCE: ac vents not working
There is a blend door acuator which moves when u change your settings. Its a electric motor. Down under dash, Will need a mech and a heating and cooling diagram to find where the motor is,
Posted on Jun 13, 2012
what position is the control switch in? does this occur when accelerating?
the door that directs air flow is controled by a vacuum motor. the default position for the door directs air flow to the defrost vents in the event of vacuum loss to ensure the windsheild will be clear of mist. if there is a small leak, vacuum will temporarily be removed when accellerating and the motor will revert to the default position. there are vacuum lines from the control knob to the motor you must check these lines for leaks. the diaphram in the motor may be bad. also check the main vacuum supply line to the control knob. usually red in color. if there is a vacuum storage cannister. it may be leaking. this cannister will maintain vacuum for the circuit when accellerating. engine vacuum decreases when accellerating.
Posted on May 31, 2010
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